You suggested the same thing that Stead did :) Unfortunately using F11 or "Full Screen" mode limits you to just that being in full screen mode. Application mode allows you to use the browser as normal without all of the (in this case) unnecessary toolbars and drop down menus.
– ForceJul 16 '14 at 20:12

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i think your solution is more of a permanent fix for specific sites, where mine is more of a situational fix :)
– neaumusicJul 16 '14 at 22:40

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For mac, you have to run /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --app=<url>
– Christopher SwaseyOct 29 '14 at 15:34

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While using --app how to tell Chrome.exe to run as a single process (not making too many processes in alt+ctrl+del list? so that the CPU and Memory is used but cleaned up)
– YumYumYumMar 26 '15 at 11:09

Uh, it's possible the user simply wants to have the web page in a window with nothing but the page and the window frame (no address bar or tab bar). Entering full screen is not the answer then.
– ADTCFeb 3 '15 at 3:40

This shortcut appears to be broken in Chrome 46 (dev channel). Anyone have any ideas?
– advaitAug 17 '15 at 3:06

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CMD+Shift+F will hide the navbar once you're in fullscreen mode
– neaumusicJul 14 '16 at 20:01

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or ONLY when you're in full screen mode
– Dan RosenstarkNov 16 '16 at 2:13

Super ! I just did some tutorial screencasts (using ScreenFlow on Mac) and it worked brilliantly using this Always Show Toolbar in Full Screen mode option. I disabled the toolbar as shown, and it displayed a Java web application perfectly for screen capture. Thanks !
– Webel IT Australia - upvoterSep 22 '17 at 10:43

In the latest version of Chrome (Version 50.0.2661.94 m) you can accomplish this by going to the menu and then clicking -> More Tools -> Add to Desktop. You will then want to check off "Open as Window" in the popup that appears and then click "Add". Screen shots below:

If you would like to know how to hide the YouTube search bar that appears at the top of the pop-out: Right-click and choose "Inspect element" to open the developer tools. Locate "masthead-positioner" and press Delete twice. Now you can size the screen so that only the video is visible!
– Steve PitchersMay 4 '16 at 18:23

Even though the question is about gaining some space removing the address bar, you can also gain some space by toggling the bookmark bar on and off, using Ctrl + Shift + B, or ⌘ Cmd + Shift + B, in Mac OS.